src/search/barsecondrowflowlayout.cpp

   1 /*
   2     SPDX-FileCopyrightText: 2025 Felix Ernst <felixernst@kde.org>
   3
   4     SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
   5 */
   6
   7 #include "barsecondrowflowlayout.h"
   8
   9 #include <QWidget>
  10
  11 #include <vector>
  12
  13 using namespace Search;
  14
  15 namespace
  16 {
  17 constexpr int searchLocationButtonsCount = 2;
  18 }
  19
  20 BarSecondRowFlowLayout::BarSecondRowFlowLayout(QWidget *parent)
  21     : QLayout{parent}
  22 {
  23     setContentsMargins(0, 0, 0, 0);
  24 }
  25
  26 BarSecondRowFlowLayout::~BarSecondRowFlowLayout()
  27 {
  28     QLayoutItem *item;
  29     while ((item = takeAt(0)))
  30         delete item;
  31 }
  32
  33 void BarSecondRowFlowLayout::addItem(QLayoutItem *item)
  34 {
  35     itemList.append(item);
  36 }
  37
  38 Qt::Orientations BarSecondRowFlowLayout::expandingDirections() const
  39 {
  40     return {};
  41 }
  42
  43 bool BarSecondRowFlowLayout::hasHeightForWidth() const
  44 {
  45     return false;
  46 }
  47
  48 int BarSecondRowFlowLayout::count() const
  49 {
  50     return itemList.size();
  51 }
  52
  53 QLayoutItem *BarSecondRowFlowLayout::itemAt(int index) const
  54 {
  55     return itemList.value(index);
  56 }
  57
  58 QSize BarSecondRowFlowLayout::sizeHint() const
  59 {
  60     const QRect rect = geometry();
  61     QSize size;
  62     for (const QLayoutItem *item : std::as_const(itemList)) {
  63         size = size.expandedTo(QSize{item->geometry().right() - rect.x(), item->geometry().bottom() - rect.y()});
  64     }
  65     return size;
  66 }
  67
  68 void BarSecondRowFlowLayout::setGeometry(const QRect &rect)
  69 {
  70     const int oldHeightHint = sizeHint().height();
  71     QLayout::setGeometry(rect);
  72     const bool isLeftToRight = itemAt(0)->widget()->layoutDirection() == Qt::LeftToRight;
  73     int x = rect.left();
  74     int y = rect.top();
  75
  76     /// The search location buttons are treated differently. They are meant to be in the same row and aligned the other way.
  77     int totalLocationButtonWidth = 0;
  78     for (int i = 0; i < searchLocationButtonsCount; i++) {
  79         totalLocationButtonWidth += itemAt(i)->widget()->sizeHint().width();
  80     }
  81     if (totalLocationButtonWidth > rect.width()) {
  82         /// There is not enough space so we will smush all the location buttons into the first row.
  83         for (int i = 0; i < searchLocationButtonsCount; i++) {
  84             QWidget *widget = itemAt(i)->widget();
  85             const int targetWidth = qMin(widget->sizeHint().width(), rect.width() / searchLocationButtonsCount);
  86             widget->setGeometry(isLeftToRight ? x : rect.right() - x - targetWidth, y, targetWidth, widget->sizeHint().height());
  87             x += widget->width();
  88         }
  89     } else {
  90         for (int i = 0; i < searchLocationButtonsCount; i++) {
  91             QWidget *widget = itemAt(i)->widget();
  92             QSize preferredSize = widget->sizeHint();
  93             widget->setGeometry(isLeftToRight ? x : rect.right() - x - preferredSize.width(), y, preferredSize.width(), preferredSize.height());
  94             x += widget->width() + spacing();
  95         }
  96     }
  97
  98     // We want to align all further widgets the other way. We do this by first filling up the row like usual and then moving all widgets of the current row by
  99     // the remaining space.
 100     std::vector<QWidget *> currentRowWidgets;
 101     for (int i = searchLocationButtonsCount; i < count(); i++) {
 102         QWidget *widget = itemAt(i)->widget();
 103         const int remainingSpace = rect.right() - x + spacing();
 104         if (widget->sizeHint().width() < remainingSpace) {
 105             QSize preferredSize = widget->sizeHint();
 106             widget->setGeometry(isLeftToRight ? x : rect.right() - x - preferredSize.width(), y, preferredSize.width(), preferredSize.height());
 107             x += widget->width() + spacing();
 108             currentRowWidgets.push_back(widget);
 109             continue;
 110         }
 111
 112         // There is not enough space for the next widget. We need to open up a new row.
 113         // Right align all the widgets of the previous row.
 114         for (QWidget *widget : std::as_const(currentRowWidgets)) {
 115             widget->setGeometry(widget->geometry().translated(isLeftToRight ? remainingSpace : -remainingSpace, 0));
 116         }
 117         currentRowWidgets.clear();
 118
 119         x = 0;
 120         y += itemAt(i - 1)->widget()->height() + spacing();
 121
 122         QSize preferredSize = widget->sizeHint();
 123         const int targetWidth = qMin(preferredSize.width(), rect.width());
 124         widget->setGeometry(isLeftToRight ? x : rect.right() - x - targetWidth, y, targetWidth, preferredSize.height());
 125         x += widget->width() + spacing();
 126         currentRowWidgets.push_back(widget);
 127     }
 128
 129     // Right align all the widgets of the previous row.
 130     int remainingSpace = rect.right() - x + spacing();
 131     for (QWidget *widget : std::as_const(currentRowWidgets)) {
 132         widget->setGeometry(widget->geometry().translated(isLeftToRight ? remainingSpace : -remainingSpace, 0));
 133     }
 134
 135     if (sizeHint().height() != oldHeightHint) {
 136         Q_EMIT heightHintChanged();
 137     }
 138 }
 139
 140 QSize BarSecondRowFlowLayout::minimumSize() const
 141 {
 142     return QSize{0, sizeHint().height()};
 143 }
 144
 145 QLayoutItem *BarSecondRowFlowLayout::takeAt(int index)
 146 {
 147     if (index >= 0 && index < itemList.size())
 148         return itemList.takeAt(index);
 149     return nullptr;
 150 }